Papers in International Journals

• Selvarangam, S.; Madhan, M.; Thandapani, E. ; Pinelas, Sandra (2018)  Improved Oscillation Theorems For Third Order Neutral Type Difference Equations . Electronic Journal of Differential Equations, (in press).

• Ramdoss, M. ; Pinelas, Sandra; Raj, A. Antony  (2018)  Stability of Nonic Functional Equations in Multi-Banach Spaces . Global Journal of Mathematics, (in press).

• Ramdoss, M. ; Pinelas, Sandra; Veeramani, V.  (2018)  Stability of Tridecic Functional Equation in Matrix Normed Spaces . Journal of Advances in Mathematics, (in press).

• Narasimman, P. ; Ravi, K.; Pinelas, Sandra (2016)  Modeling the Additive Functional Equations Through RSM Matrices . Journal of Advances in Mathematics: 12(10), 6714-6719.

• Thandapani, E. ; Manju, K.; Pinelas, Sandra (2016)  Interval Oscillation Criteria for Second-order Forced Impulsive Delay Differential Equations with Damping Term . SpringerPlus: 5:558, 1-16.

• Salvarangam, S.; Geetha, S.; Thandapani, E.; Pinelas, Sandra (2016)  Classification of Solutions of Second Order Nonlinear Neutral Difference Equations of Mixed Type . Journal Dynamics of Continuous, Discrete and Impulsive Systems, Series B: Applications and Algoritms: 23, 433-447.

• Ravi, K. ; Rassias, J.M.; Pinelas, Sandra; Suresh, S. (2016)  General Solutions and Stability of Quattuordecic Functional Equation in Quasi \beta – Normed Spaces . Advances in Pure Mathematics: 6, 921-941.

• Berezansky, L. ; Pinelas, Sandra (2016)  Oscillation Properties for a Scalar Linear Difference Equation of Mixed Type . Mathematica Bohemica: 2, 169-182.

• Tripathy, A.K.; Santra, S.S.; Pinelas, Sandra (2016)  Necessary and sufficient condition for asymptotic behavior of solutions of a class of first order impulsive systems . Advances in Dynamical Systems and Applications: 11(2), 135-145.

• Santra, S.S.; Pinelas, Sandra (2016)  Qualitative behaviour for second order nonlinear delay differential equations of neutral type . Global Journal of Mathematics: 8(3).

• Ravi, K. ; Rassias, J.M.; Pinelas, Sandra; Sabarinathan, S.  (2016)  A Fixed Point Approach to the Stability of Decic Functional Equation in Quasi-\beta-Normed Spaces . PanAmerica Math Journal: 26(2), 1-21.

• K. Ravi; Pinelas, Sandra; R. Jamina (2015)  HUR-UGR-UJR Stabilities of a kl-cubic Funcional Equation in Quasi-beta-normed Spaces: Direct and Fixed Point Methods . Enlightenment of Pure and Applied Mathematics: 1(2), 61-78.

• Chatzarakis, G. E.; Manojlovic, J.; Pinelas, Sandra; Stavroulakis, I. P. (2015)  Oscillation criteria of difference equations with several deviating arguments . The Yokohama Mathematical Journal: 60, 1-19.

• E. Thandapani,; D. Seghar; Pinelas, Sandra (2015)  Oscillation Theorems for Second Order Difference Equations with Negative Neutral Term . Tamkang Journal of Mathematics: 46(4), 441-451.

• R. Koplatadze ; Pinelas, Sandra (2015)  Oscillation Criteria for First Order Linear Difference Equations with Several Delay Arguments . Journal of Mathematical Sciences: 28(5), 571-592.

• George E Chatzarakis; Hajnalka Péics; Pinelas, Sandra; Ioannis P Stavroulakis (2015)  Oscillation Results for Difference Equations with Oscillating Coefficients . Advances in Difference Equations, 2015:53.

• K. Ravi; Pinelas, Sandra; A. Edwin Raj (2015)  A fixed Point Approach to Generalized Hyers-Ulam Stability of Quadratic Functional Equation in Matrix Normed Space . Enlightenment of Pure and Applied Mathematics: 1(2), 37-52.

• P. Narasimman,; K. Ravi; Pinelas, Sandra (2015)  Stability of Pythagorean Mean Functional Equation . Global Journal of Mathematics: 4(1), 398-411.

• D. Segher; E. Thandapani; Pinelas, Sandra (2015)  Some New Oscillation Theorems for Second Order Difference Equations with Mixed Neutral Terms . British Journal of Mathematics & Computer Sciences: 8(2), 121-133.

• Ravi, K. ; Rassias, J.M.; Pinelas, Sandra; Jamuna, R. (2014)  A fixed point approach to the stability of a quadratic quartic functional equation in Paranormed spaces . Pan-American Mathematical Journal: 24(2), 61–84.

• Selvarangam, S.; Thandapani, E.; Pinelas, Sandra (2014)  Oscillation Theorems for Second Order Nonlinear Neutral Difference Equations . Journal of Inequalities and Apllications: 2014, 417.

• Ferreira, J. M. ; Pinelas, Sandra; Ruffin, A. (2014)  Oscillatory Difference Equations and Moment Problems . Advances in Difference Equations: 1, 110.

• Thandapani, E.; Padmavathi, S.; Pinelas, Sandra (2014)  Oscillation Results For Odd-order Nonlinear Neutral Differential Equations of Mixed Type . Dynamic Systems and Applications: 23, 63-74.

• Ravi, K.; Rassias, J. M.; Pinelas, Sandra; Narasimman, P. (2014)  The Stability of a Generalized Radical Reciprocal Quadratic Functional Equation in Felbin’s Space . Pan-American Mathematical Journal: 24(1), 75-92.

• Koplatadze, R.; Pinelas, Sandra (2014)  Oscillation Criteria for First Order Linear Difference Equations with Several Delay Arguments . Nonlinear Oscillations: 17(2), 248-267.

• Pinelas, Sandra (2014)  Asymptotic Behavior of Mixed Type Differential Equation . Electronic Journal of Differential Equations: 2014, 1-9.

• Thandapani, E.; Padmavathi, S.; Pinelas, Sandra (2014)  Oscillation Criteria For Odd-Order Nonlinear Neutral Differential Equations with Mixed Arguments . Electronic Journal of Differential Equations: 2014(174), 1-13.

• Thandapani, E.; Padmavathi, S.; Pinelas, Sandra (2014)  Oscillation Criteria For Even-Order Nonlinear Neutral Differential Equations of Mixed Type . Bulletin of Mathematical Analysis and Applications: 6(1), 9-22.

• Thandapani, E.; Padmavathi, S; Pinelas, Sandra (2013)  Oscillation Criteria For Even Order Nonlinear Neutral Differential Equations With Mixed Arguments . Journal of Advances in Mathematics: 5, 575-589.

• Koplatadze, R. ; Pinelas, Sandra (2013)  On oscillations of solutions of second order nonlinear difference equations . Journal of Mathematical Sciences: 189(5), 784-794.

• Agarwal, R.P.; Bohner, M.; Ferreira, J.M.; Pinelas, Sandra (2013)  Delay difference equations: coexistence of oscillatory and nonoscillatory solutions . Analysis: 33, 333-348.

• Chatzarakis, G. E.; Pinelas, Sandra; Stavroulakis, I. P. (2013)  Oscillations of Difference Equations with Several Deviated Arguments . Aequationes Mathematicea: 88(1-2), 105-123.

• Grace, S.R.; Pinelas, Sandra; Agarwal, R.P. (2013)  Oscillation criteria for n-th order nonlinear dynamic equations on time-scales . Journal of the Indian Mathematical Society: 80(1-2), 79-85.

• Pinelas, Sandra; Koplatadze, R. (2012)  Oscillation of nonlinear difference equations with delayed argument . Communications in Applied Analysis: 16(1), 87-96.

• Thandapani, E.; Piramanantham, V.; Pinelas, Sandra (2012)  Oscillation theorems of fourth order nonlinear dynamic equations on time scales . International Journal of Pure and Applied Mathematics: 76(4), 455-468.

• Thandapani, E.; Kavitha, N.; Pinelas, Sandra (2012)  Oscillation criteria for second-order nonlinear neutral difference equations of mixed type . Advances in Difference Equations: 4, 1-10.

• Koplatadze, R. ; Pinelas, Sandra (2012)  On oscillations of solutions of second order nonlinear difference equations . Nonlinear Oscillations: 15(2), 194-203.

• Grace, S.R.; Pinelas, Sandra; Agarwal, R. P. (2012)  Oscillatory behaviour of odd order neutral delay dynamic equations on time-scales . International Journal of Dynamical Systems and Differential Equations: 4(3), 187-197.

• Thandapani, E.; Padmavathi, S.; Pinelas, Sandra (2012)  Classifications of solutions of second-order nonlinear neutral differential equations of mixed type . Advances in Difference Equations: 226.

• Thandapani, E.; Kavitha, N.; Pinelas, Sandra (2012)  Comparison and oscillation theorem for second-order nonlinear neutral difference equations of mixed type . Dynamic Systems and Applications: 21, 83-92.

• Thandapani, E.; Piramanantham, V.; Pinelas, Sandra (2011)  Oscillation criteria for second order neutral delay dynamic equations with mixed nonlinearities . Advances in Difference Equations: 2011, 513757.

• Grace, S.R.; Agarwal, R.P.; Bohner, M.; Pinelas, Sandra (2011)  Oscillation of Some Fourth-Order Difference Equations . International Journal of Difference Equations: 6(2), 105-112.

• Agarwal, R.P.; Benchohra, M.; Hamani, S.; Pinelas, Sandra (2011)  Boundary Value Problems for Differential Equations Involving Riemann-Liouville Fractional Derivative on the Half-Line . DCDIS: Dynamics of Continuous, Discrete and Impulsive Systems: 18(2), 235-244.

• Ferreira, J. M.; Ford, N. J.; Malique, Md. A.; Pinelas, Sandra; Yan, Y. (2011)  Analytical and numerical treatment of oscillatory mixed differential equations with differentiable delays and advances . Journal of Computational and Applied Mathematics: 235(17), 5112-5130.

• Grace, S. R.; Agarwal, R. P.; Pinelas, Sandra (2011)  Oscillation Criteria for a Certain Fourth Order Sublinear Dynamic Equations on Time Scales . Annals of Differential Equations: 3, 361-366.

• Grace, S.R.; Agarwal, R.P.; Pinelas, Sandra (2011)  On the Oscillation of Fourth Order Superlinear Dynamic Equations on Time Scales . Dynamic Systems and Applications: 20, 45-54.

• Grace, S.R.; Agarwal, R.P.; Pinelas, Sandra (2011)  Comparison and oscillatory behavior for certain second order nonlinear dynamic equations . Journal of Applied Mathematics and Computing: 35(1-2), 525-536.

• Agarwal, R.P.; Benchohra, M.; Hamani, S.; Pinelas, Sandra (2011)  Upper and Lower Solutions Method for Impulsive Differential Equations Involving the Caputo Fractional Derivative . Memoirs on Differential Equations and Mathematical Physics: 53, 1-12.

• Grace, S.R.; Agarwal, R.P.; Pinelas, Sandra (2010)  On the oscillatory and asymptotic behavior of certain fourth order difference equations . Functional Differential Equations: 17(1-2), 105-112.

• Thandapani, E.; Murugadass, S.; Pinelas, Sandra (2010)  Oscillation Criteria for Forced Second Order Mixed Type Quasilinear Delay Differential Equations . Electronic Journal of Differential Equations: 73, 1-9.

• Grace, S. R.; Pinelas, Sandra (2010)  Asymptotic Behavior of Solutions of Certain Nonlinear Differential and Integro-differential Equations . Proc. Jangjeon Math. Soc.: 13, 133-148.

• Ferreira, J. M. ; Pinelas, Sandra (2010)  Oscillatory generalized Lucas sequences . International Journal of Differential Equations: 2010, 1-15.

• Grace, S. R.; Agarwal, R. P.; Pinelas, Sandra (2010)  Oscillation Criteria for Certain Fourth Order Nonlinear Difference Equations . Communications in Applied Analysis: 14(4), 337-342.

• Agarwal, R. P.; O’Regan, D.; Pinelas, Sandra (2010)  Bounds for Analytic Solutions to Integral Equations in the Complex Domain . Applied Mathematics Letters: 23(8), 847-851.

• Thandapani, E.; Murugadass, S.; Pinelas, Sandra (2010)  Oscillations criteria for second order nonlinear differential equations with damping and mixed nonlinearities . Functional Differential Equations: 17(3-4), 1-10.

• Ferreira, J. M. ; Pinelas, Sandra (2010)  Oscillatory mixed differential systems . Funkcialaj Ekvacioj: 53, 1-20.

• Ravi, K.; Kumar, B. V. S.; Thandapani, E; Pinelas, Sandra (2010)  Solution and Generalized Hyers-Ulam Stability of a 2-variable Cubic Functional Equation . Pan American Mathematical Journal: 20, 15-30.

• Ferreira, J.M.; Pinelas, Sandra; Ruffing, A. (2009)  Nonautonomous oscillators and coefficient evaluation for orthogonal function systems . Journal of Difference Equations and Applications: 15(11-12), 1117-1133.

• Agarwal, R.P.; Pinelas, Sandra (2009)  Qualitative theory of divided difference first order systems . Communications on Applied Nonlinear Analysis: 16(2), 83-105.

• Pinelas, Sandra (2009)  Oscillations and nonoscillations in mixed differential equations with monotonic delays and advances . Advances in Dynamical Systems and Applications: 4(1), 107-121.

• Grace, S.R.; Argawal, R.P.; Pinelas, Sandra (2009)  On the oscillations of fourth order functional differential equations . Communications in Applied Analysis: 13(1), 93-104.

• Berezansky, L.; Braverman, E.; Pinelas, Sandra (2009)  On nonoscillation of mixed advanceddelay differential equations with positive and negative coefficients . Computers & Mathematics with Applications: 58(4), 766-775.

• Agarwal, R.P.; Pinelas, Sandra; Wong, P.J.Y. (2009)  Complementary Lidstone interpolation and boundary value problems . Journal of Inequalities and Applications, 624-631.

• Ferreira, J. M. ; Pinelas, Sandra (2006)  Oscillatory mixed difference systems . Advances in Difference Equations: Article ID 92923, 1-18.

• Ferreira, J. M. ; Pinelas, Sandra (2005)  Nonoscillations in retarded systems . Journal of Mathematical Analysis and Applications: 308, 714-729.

• Ferreira, J. M. ; Pinelas, Sandra (2003)  Oscillatory retarded functional systems . Journal of Mathematical Analysis and Applications: 285, 506-527.

Books

• Pinelas, Sandra; Dosla, Z.; Dosly, O.; Kloeden, P. (2016)  Differential and Difference Equations with Applications . Springer Proceedings in Mathematics & Statistics, Springer, New York: 164, 451.

• Agarwal, R. P.; Perera, K.; Pinelas, Sandra (2011)  An Introduction to Complex Analysis . Springer, 231 pp..

Papers or Chapters in Edited Books

• Pinelas, Sandra (2010)  Oscillatory mixed differential difference equations . Discrete Dynamics and Difference Equations: 2010, 355-364.

• Pinelas, Sandra (2006)  Nonoscillations in odd order difference systems of mixed type . World Scientific, 507-519.

Communications in Conference Proceedings

• Pinelas, Sandra;  (2005)  Nonoscillations in retarded equations . GBS Publishers & Distributors, 563-571.

Edition of Books

• Torres, D.F.M.; Benchohra, M.; Debbouche, A.; Pinelas, Sandra (2013)  Special Issue: Difference and Differential Equations . International Journal of Differential Equations, Hindawi: 8(1), ISSN 0973-6069.

• Pinelas, Sandra; Chipot, M.; Dosla, Z. (2013)  Differential and Difference Equations with Applications . Springer Proceedings in Mathematics & Statistics: 47, 665.

• Bohner, M.; Dosla, Z.; Pinelas, Sandra (2012)  Oscillation of Difference, Differential, and Dynamic Equations . Advances in Difference Equations.

Participation on International Conferences 

1. O mundo de Tarski, conferência no Colóquio sobre Ensino e Aplicações da Matemática, integrado no Dia da Ciência e Tecnologia (Universidade de Évora), June 1993.
2. Comportamento oscilatório em sistemas retardados, Seminário no Departamento de Matemática da Universidade dos Açores sob o tema Sistemas Dinâmicos e Aplicações, July 2004, Ponta Delgada, Portugal.
3. Nonoscilations in Retarded Equations, International conference on Dynamic Systems and Applications, 5th -10th August 2004, Antalya, Turkey.
4. Nonoscillations in odd order difference systems of mixed type, International Conference on Difference Equations, Special Functions & Applications, 25th -30th July 2005, Munique, Germany.
5. Oscillations in difference systems of mixed type, Progress on Difference Equations, 5th -9th March 2006, Homburg, Germany.
6. Comportamento Oscilatório de Sistemas às Diferenças, Seminário no Departamento de Matemática da Universidade dos Açores, December 2006, Ponta Delgada, Portugal.
7. A hierarquia de Chomsky nos Autómatos Celulares, Seminário no Departamento de Matemática da Universidade dos Açores, January 2007, Ponta Delgada, Portugal.
8. Comportamento Oscilatório de Sistemas às Diferenças, Seminário no Departamento de Matemática da Universidade de Aveiro, Grupo de Análise Funcional e Aplicações, 3th May 2007, Aveiro, Portugal.
9. Oscillatory Behavior of Mixed Differential Difference Equations, International Conference on Difference Equations, Special Functions & Applications, 23th -27th de July 2007, Lisboa, Portugal.
10. Oscillatory Mixed Differential Equations with Monotonic Delays and Advances, International Conference in honour of Professor Dr. Allan Peterson, 29th July - 2nd August 2007, Novacella Monastery, Italy.
11. Oscillatory mixed differential systems, Progress on Difference Equations, Conference in honour of Professor Dr. Saber Elaydi, 12th -17th March 2008, Laufen, Germany.
12. Bounded solutions of a rational difference equation, 14th International Conference on Difference Equations, Special Functions & Applications, 21th -25th July 2008, Istambul, Turkey.
13. Bounded solutions of a rational difference equation, Winter Conference in Difference Equations, 8th -12th January 2009, Homburg, Germany.
14. On oscillatory generalized Lucas sequences, Progress on Difference Equations, Conference in honour of Professor Dr. Gerry Ladas, 25th - 29th May 2009, Bedlewo, Poland.
15. Qualitative Theory of Divided Difference First Order Systems, Equadiff 12, 20th - 24th July 2009, Brno, Czech Republic.
16. Oscillatory mixed differential systems, International workshop Functional Differencial Equations and Related Problems: Analysis and Numerical Approaches, Departamento de Matemática do Instituto Superior Técnico da Universidade Técnica de Lisboa, 18th February 2010, Lisboa, Portugal.
17. Simultaneous Oscillation and Nonoscillation of Some Retarded Functional Equations, The 6th International Conference: Dynamical Systems and Applications, 10th -14th July 2010, Antalya, Turkey.
18. Teoria qualitativa de sistemas de primeira ordem com diferenças divididas, Dia das Equações, 10th September 2010, Braga, Portugal.
19. Coexistência de Oscilações e Não-oscilações, Seminários de Análise, 23th May 2012, Portugal.
20. Asymptotic and Oscillatory Behaviour of the Solutions of a Difference Equation with Several Arguments, Symposium on Differential Equations and Difference Equations, 28th October - 1st November 2012, Novacella, Italy.
21. Optimal oscillation criteria for first order difference equations with several delay arguments, Symposium on Differential Equations and Difference Equations 2013, 1st - 5th Setember 2013, Bairyschzell, Germany.
22. Asymptotic and oscillatory behavior of the solutions of a difference equation with several arguments, 10th AIMS International Conference on Dynamical Systems, Differential Equations and Applications, 7th – 11th July 2014, Madrid, Spain. 
23. Oscillation criteria for nonlinear neutral differential equations with mixed arguments, 10th AIMS International Conference on Dynamical Systems, Differential Equations and Applications, 7th – 11th July 2014, Madrid, Spain. 
24. Oscillatory and nonoscillatory solutions for difference equations with several delays, The Seventh International Conference on Differential and Functional Differential Equations, 22nd – 99th August 2014, Moscow, Russia. (Main Speaker).
25. Assymptotic behavior of a differential equation with delay and advances, The 3th Abu Dhabi University Annual International Conference: Mathematical Science and its Applications, 27th – 30th December, 2014, Abu Dhabi, United Arab Emirates. (Plenary Speaker).
26. Asymptotic behavior of a differential equation with several delays and advances (II), Second Tbilisi-Salermo Workshop on Modeling in Mathematics, 16th -18th  March 2015, Tbilisi, Georgia (Plenary Speaker).
27. Asymptotic behavior of a differential equation with several delays and advances, 12th International Symposium on Stability, Vibration and Control of Systems, 6th - 8th May 2015, Prague, Republica Checa (Plenary Speaker).
28. Oscillatory Behavior of mixed Systems, 12th International Symposium on Stability, Vibration and Control of Systems, 6th - 8th May de 2015, Prague, Czech Republic (Plenary Speaker).
29. Asymptotic behavior of mixed type differential and difference equations, The Modeling of Nonlinear Processes and Systems (MNPS 2015), 22th - 26th June 2015, Moscow, Russia (Plenary Speaker).
30. Oscillation of solutions to non-linear first-order difference equations with several advanced arguments, Seminar in Differential Equations, 30 May – 3 June 2016, Ostrov, Czech Republic.
31. Oscillation of solutions to non-linear first-order difference equations with several advanced arguments, International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2016), 19th – 25th September 2016, Rhodes, Greece.
32. Oscillatory Behaviour of a delay Differential System of Order Even, International Conference on Mathematical Applications in Engineering and Technology, Sacred Heart College, 27th – 28th January 2017,  Tirupattur, India (Plenary Speaker).
33. The Division by Zero z/0 = 0 and Differential Equation, International Conference on Mathematical Applications in Engineering and Technology, Sacred Heart College, 27th – 28th January 2017,  Tirupattur, India (Plenary Speaker).
34. The Importance of the Brahmagupta in our days: He was right!, International Conference on Mathematical Advances, Don Bosco College, 27th January 2017, Yelagiri Hills, India (Plenary Speaker).
35. A New Century a New Challenge: Division by Zero is Possible, International Conference Recent Trends in Mathematics, Islamiah College,  29th January 2017, Vaniyambadi, India (Plenary Speaker).
36. Behavior of a Scalar Linear Difference Equation of Mixed Type, International Conference on Recent Advances in Analysis and its Applications, Vivekanandha College of Arts & Science for Women,  30th – 31th January 2017, Tiruchengode, India (Plenary Speaker).
37. The Division by Zero z/0=0: A new challenge, International Conference on Recent Advances in Analysis and its Applications, Vivekanandha College of Arts & Science for Women, 30th – 31th January 2017, Tiruchengode, India (Plenary Speaker). 
38. Oscillatory Behavior of a Differential System with Delay of Order n, 9th Dynamical Systems and its Applications in Engineering and Environmental Sciences International Conference, 12th – 31st July 2017, Alanya, Turquia (Plenary Speaker).
39. New Century, New Challenge: 1/0 = 100/0 = 0, 9th Dynamical Systems and its Applications in Engineering and Environmental Sciences International Conference, 12th – 31st July 2017, Alanya, Turquia (Plenary Speaker).
40. Oscillatory and Nonoscillatory Behaviour of a Differential Delay System of nth-order, Centro de Matemática da Universidade de Coimbra, 11 October 2017, Coimbra, Portugal.
41. Oscillation Properties for a Scalar Linear Mixed Type Difference Equation, Centro de Matemática e Aplicações, Universidade Nova de Lisboa, 11 March 2018, Caparica, Portugal
42. Necessary and Sufficient Conditions for the Oscillatory Behavior of Solutions to Second Order Nonlinear Differential Equations with Several Delays, International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2018), 13 – 18 de September 2018, Rhodes, Grecia